[issue45703] importlib.invalidate_caches() does not invalidate _NamespacePath's _last_parent_path-based cache

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

The automated backport to Python 3.9 failed. Miro asked me to close the PR:
https://github.com/python/cpython/pull/29964

Can someone backport the fix to 3.9? (create a PR)

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